这是一个同用Java代码实现的二维数组与将数组扩大两倍

import java.util.Arrays;

public class Test {

//把数组中每个数据扩大2倍

public static int[] func1(int[] array) {

int[] ret = new int[array.length];

for (int i = 0; i < array.length; i++) {

ret[i] = array[i] * 2;

}

return ret;

}

public static void main(String[] args) {

int[] array = {1, 2, 3, 4, 5};

//int[] array2 =null;

//System.out.println(array2.length);

//System.out.println(array2[0]);

int[] tmp = func1(array);

System.out.println(Arrays.toString(array));

System.out.println(Arrays.toString(tmp));

}

}

//把数组中的每个数据扩大两倍--数组本身扩大2倍

public static void func2(int[] array) {

for (int i = 0; i < array.length; i++) {

array[i] = array[i] * 2;

}

}

public static void main(String[] args) {

int[] array = {1, 2, 3, 4, 5};

System.out.println(Arrays.toString(array));

func2(array);

System.out.println(Arrays.toString(array));

}